Timed board standard deviation should be different for first interval

[Amphitryon0]

Because there is much more time spent outside of the game before the first board, the estimate of RNG steps for that interval cannot be as precise. This theoretical effect is observed in practice, where both Linkus and Alberto have much higher standard deviations for the first timer estimate than for later estimates (180 to 31 for Linkus and 179 to 33 for Alberto).

The effect of this right now is that the standard deviation used for one or both of the games will be suboptimal. The effect was initially so pronounced that Linkus asked for this change on the same day the timer was introduced, though changes introduced soon thereafter made it less necessary.